In the given reaction Product A is:

(A) 
(B) 
(C) 
(D) 

The product of hydrolysis of propyne in the presence of 1% \( HgSO_4 \) and 40% \( H_2SO_4 \) is ___________.
The structures of major products A , B and C in the following reaction are sequence


Method used for separation of mixture of products (B and C) obtained in the following reaction is: 